I have custom ACOG and PU scopes on my mod which are using the Vanilla textures for their reticles.
And they worked fine so far.

However, i worked on a update for that Mod and for some reason the Reticle on both optics stopped working...
They do not display anymore. The only thing that helped on our Test server was to relog with the scope and then the player was able to see the reticle.
We had to Update the main server Yesterday and atleast one of our Players has the same issue but he has reloged already twice and could not fix it.

I am packing my mod with the Experimental branch
And i am Using Mikero 3.38.8.75
The mod is IntenZ-Pack
If you need more feedback on this, let me know